Proceedings Paper

Layer 1 VPN (L1VPN) extends the notion of VPN to the optical domain to provide virtually dedicated circuit like leased
lines, so that the security is more enhanced. Despite their secure gains from channel isolation, VPNs still suffer fragilities
resulting from link-failures or node-failures. Extensive activities on survivability designs for wavelength-routed optical
networks are proposed, including various protection and restoration schemes, but concerns on network edge are rare.
Dual-homing is an effective skill to achieve survivability gains for L1VPNs. There are two dual-homing mode:
Active/Standby mode and Load-Sharing mode In this paper, we investigate the problem of PE assignment, which is the
key of dual-homing design and is NP-hard. We formulate it as an integer programming problem, and propose heuristic
solutions. Simulation results show that the proposed solutions work in a correct and effective way and the Load-Sharing
mode has higher bandwidth efficiency than Active/Standby mode.